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Circuits and Systems, IEEE Transactions on

Issue 9 • Date September 1975

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Displaying Results 1 - 12 of 12
  • Comments on "Transfer Function Synthesis using a Current Conveyor

    Publication Year: 1975 , Page(s): 763 - 764
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  • Comments on "Reduction of Roundoff Noise in Wave Digital filters

    Publication Year: 1975 , Page(s): 764
    Cited by:  Papers (3)
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  • Nonideal negative resistors and capacitors using an operational amplifier

    Publication Year: 1975 , Page(s): 760 - 763
    Cited by:  Papers (6)  |  Patents (23)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    Negative impedance converters (NIC's) may be used to realize negative driving-point impedances. The effect of the nonideal characteristics of the operational amplifier such as finite frequencydependent gain and output impedance on the performance of the negative impedances is analyzed. Detailed equivalent circuits showing the additional positive or negative inductive impedances due to the nonideal characteristics are given for negative resistance and negative capacitance realizations, and their relative performances are compared. The experimental results confirm the validity of the equivalent circuits. The effect of the slew rate of the operational amplifier on the maximum signal-handling capability (SHC) of the negative impedances at high frequencies is studied. Practical design considerations for achieving wider bandwidth as well as improved SHC are discussed. View full abstract»

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  • A new algorithm in spectral analysis and band-limited extrapolation

    Publication Year: 1975 , Page(s): 735 - 742
    Cited by:  Papers (306)  |  Patents (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (696 KB)  

    If only a segment of a function f (t) is given, then its Fourier spectrum F(\omega ) is estimated either as the transform of the product of f(t) with a time-limited window w(t) , or by certain techniques based on various a priori assumptions. In the following, a new algorithm is proposed for computing the transform of a band-limited function. The algorithm is a simple iteration involving only the fast Fourier transform (FFT). The effect of noise and the error due to aliasing are determined and it is shown that they can be controlled by early termination of the iteration. The proposed method can also be used to extrapolate bandlimited functions. View full abstract»

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  • Computation of group delay from attenuation characteristics via Hilbert transformation and spline function and its application to filter design

    Publication Year: 1975 , Page(s): 729 - 734
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    In this paper a method is described to compute the group delay of a minimum phase network from the attenuation characteristic via Hilbert transformation and spline function. The passband distortion due to dissipative loss can also be obtained with minimum amount of computation. The new approach eliminates all the numerical problems encountered in earlier attempts by many authors. As a result of its accuracy, the method can be profitably applied to assist the design of filters. An example is given to show the application and the numerical results of the method. View full abstract»

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  • Active RC all-pass filters containing periodically operated switches

    Publication Year: 1975 , Page(s): 764 - 767
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    Second-order active RC all-pass networks containing periodically operated switches are proposed in which the regulation of the switching parameter allows the independent adjustment of the delay characteristics. It is shown that the maximum delay time and its corresponding frequency are adjustable independently by changing the ratio of the on duration in a period to the period of switching. Two such circuits are presented along with experimental results which are in good agreement with the theoretical curves. View full abstract»

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  • Nonstationary network synthesis via state-space techniques

    Publication Year: 1975 , Page(s): 713 - 720
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (920 KB)  

    A theory is developed for nonstationary network synthesis via state-space techniques. The method is based on direct realization algorithms from a Hankel matrix (input/output) description of the system. Passive, lossless, reciprocal, reversible, and relaxation systems are considered. For each of these classes of systems, necessary and sufficient conditions on the Hankel matrix for the existence of a representation which can be synthesized with certain types of network elements are derived. In addition, algorithms for computing these representations are presented. View full abstract»

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  • A generalization of a problem of Eisemann

    Publication Year: 1975 , Page(s): 759 - 760
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    A problem is considered, proposed by K. Eisemann, which he solved with the use of generalized matrix inverses. A more general problem is discussed here, and solved by standard elementary methods. View full abstract»

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  • Complete identification of a class of nonlinear systems from steady-state frequency response

    Publication Year: 1975 , Page(s): 753 - 759
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (848 KB)  

    A solution to the identification problem for a class of nonlinear systems, based on steady-state frequency response, is presented. This class is composed of certain interconnections of stable linear dynamic systems and integer power nonlinearities. Two kinds of measurements are considered. The first involves obtaining the amplitude and relative phase of each harmonic of the steady-state frequency response, while the second involves measuring the amplitudes only. In each case we find the number of measurements sufficient to identify a system for which the highest power present and the bounds on the dimensions of the linear subsystems are known. View full abstract»

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  • Noise performance limitations of single amplifiers RC active filters

    Publication Year: 1975 , Page(s): 743 - 747
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    The noise performance characteristics of single amplifier RC active filters are presented for the cases where the circuits are constructed using the new single-ended Norton quad amplifiers. The power spectral densities and total rms values of the output noise are compared with the same quantities for filters constructed using conventional integrated operational voltage amplifiers. The conditions for minimum noise from the Norton amplifiers are derived, and these minimum levels are compared with those obtained using 741-type amplifiers. When the filters are constructed using infinite gain embedded amplifiers, for certain ranges of Q-factor and passband gain the Norton amplifiers can be biased to give comparable noise performance to the 741 amplifiers, and it is shown that the bias networks required differ significantly from those chosen in most specification sheets for these devices. For positive-gain structures, the 741 amplifiers are shown to be superior in most applications. View full abstract»

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  • A systematic search method for obtaining multiple solutions of simultaneous nonlinear equations

    Publication Year: 1975 , Page(s): 748 - 753
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (760 KB)  

    A systematic search method has been developed for obtaining the multiple solutions of a nonlinear equation of the form f(x) = 0 , where f is a continuously differentiable function from R^n \rightarrow R^n . The method is based on numerical integration of the associated system of differential equations \dot{f}_i = -f_i for i = 1, 2,\cdots , n - 1 and \dot{f}_n = \pm f_n along the space curve l of intersection f_i(x) = 0, i = 1, 2,\cdots , n - 1 . The plus or minus sign is chosen so as to make {x_k} move in the desired direction on l . View full abstract»

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  • Some properties and applications of matrix continued fraction

    Publication Year: 1975 , Page(s): 721 - 728
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (784 KB)  

    The formulation of matrix continued fraction of three Cauer matrix forms and their dynamic state equations for linear timeinvariant multivariable circuits and systems is derived. The state-space representation formulated in this paper is a minimal realization. Applications of this method to the inversion of a rational matrix whose entries are polynomials in s and to the reduction of a multivariable system are described. View full abstract»

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